- don't check exc_info() in `finally`, it only works without `except` with just `try` and `finally`
  see https://docs.python.org/3/reference/compound_stmts.html#try
  after `except Exception as e:` block, `e` is already deleted

- handle a rare case when esptool code does not close 'erase_file'.
  printing paths may cause encoding issues, so just fall through silently